Calculator
The calculator as we know it today was first invented by Pascal and Schickard in China and Germany. Now years later we have calculators on webpages and mobile phones. What will we see next?

8/24/17: This is version one of the calculator app and am currently working on version 2. With this version you can only do a calculation on two numbers and go no further. With the new version you will be able to keep adding numbers together like a real calculator.